Really?
Nobody has an opinion if the edges should be teared or deckled from the paper before or after coating the paper?
You can't get a deckled edge after the fact. A deckled edge is formed by the deckle: the wooden frame surrounding the screen on which the paper forms from the fibres. Even with true fine art paper, you will often end up with two deckle edges and two torn edges.
I have tried to create a 'good' torn edge through the ink. It didn't work with or without coating (Hahnemuhle Protective spray). Even without the protective coating, the paper top layer with ink tore differently than the base paper. You might get away with it in the borders, but not with a full bleed print.
From my experience, you would be better starting with deckle and/or torn edges, then printing.
Epson UltraChome K3 VM, Canson Rag 310 and 210, Hahnemuhle Photo Rag, 308, and Hahnemuhle German Etching 310.
I had planned to try wetting the paper at the tear line with water and a clean water colour brush. I haven't had time to try this yet. The Epson inks are very waterproof.
Brian A